public class Demo14 {
    private static int count;
    public static void main(String[] args) throws InterruptedException {
        Object block = new Object();
        Thread thread1 = new Thread(() -> {
            for (int i = 0; i < 10000; i++) {
                synchronized (block) {
                    count++;
                }
            }
        });
        Thread thread2 = new Thread(() -> {
            for (int i = 0; i < 10000; i++) {
                synchronized (block) {
                    count++;
                }
            }
        });
        thread1.start();
        thread2.start();
        thread1.join();
        thread2.join();
        System.out.println(count);
    }
}
